ATE423867T1 - TREATMENT PROCEDURE FOR CIRCUIT WATER - Google Patents

TREATMENT PROCEDURE FOR CIRCUIT WATER

Info

Publication number
ATE423867T1
ATE423867T1 AT02774036T AT02774036T ATE423867T1 AT E423867 T1 ATE423867 T1 AT E423867T1 AT 02774036 T AT02774036 T AT 02774036T AT 02774036 T AT02774036 T AT 02774036T AT E423867 T1 ATE423867 T1 AT E423867T1
Authority
AT
Austria
Prior art keywords
water
calcium ions
process water
papermaking
separated
Prior art date
Application number
AT02774036T
Other languages
German (de)
Inventor
Ny Corinne Le
Hannu Leino
Heikki Pakarinen
Original Assignee
Linde Ag
Upm Kymmene Oyj
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8561300&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ATE423867(T1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Linde Ag, Upm Kymmene Oyj filed Critical Linde Ag
Application granted granted Critical
Publication of ATE423867T1 publication Critical patent/ATE423867T1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/01—Waste products, e.g. sludge

Landscapes

  • Paper (AREA)
  • Removal Of Specific Substances (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The present invention relates a method for the treating of circulation waters in papermaking processes wherein a stream of process water separated from an aqueous cellulosic pulp suspension of the papermaking process is provided, said separated process water having an elevated level of free calcium ions. A pH of not less than pH 9 is provided in the process water. Gaseous carbon dioxide is distributed in the process water in an amount sufficient for precipitating a substantial part of the calcium ions as solid calcium carbonate in the water and for obtaining a decreased level of free calcium ions in the water. The calcium ion depleted process water is returned to the papermaking process, thereby reducing or preventing the accumulation of calcium ions circulating in the process.
AT02774036T 2001-05-30 2002-05-30 TREATMENT PROCEDURE FOR CIRCUIT WATER ATE423867T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20011131A FI20011131A (en) 2001-05-30 2001-05-30 Procedure for treating circulating water

Publications (1)

Publication Number Publication Date
ATE423867T1 true ATE423867T1 (en) 2009-03-15

Family

ID=8561300

Family Applications (1)

Application Number Title Priority Date Filing Date
AT02774036T ATE423867T1 (en) 2001-05-30 2002-05-30 TREATMENT PROCEDURE FOR CIRCUIT WATER

Country Status (5)

Country Link
EP (1) EP1402111B1 (en)
AT (1) ATE423867T1 (en)
DE (1) DE60231303D1 (en)
FI (1) FI20011131A (en)
WO (1) WO2002097189A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7056419B2 (en) 2002-09-30 2006-06-06 American Air Liquide, Inc. Methods for modifying electrical properties of papermaking compositions using carbon dioxide
CN100429161C (en) * 2005-11-29 2008-10-29 谢列兵 Water treatment process and tubular water treatment apparatus
EP1816259A1 (en) * 2006-02-07 2007-08-08 L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Use of carbon dioxide for pH control of the wet end section of a paper machine
DE102006034186A1 (en) * 2006-07-24 2008-01-31 Siemens Ag Equipment for papermaking, especially waste paper
FI20065727A0 (en) 2006-11-15 2006-11-15 Linde Ag A method for reducing sedimentation in the pulp and paper industry
FI20096259A0 (en) 2009-11-30 2009-11-30 Linde Ag METHOD AND SYSTEM FOR TREATMENT OF PROCESSED WATER
FI127995B (en) * 2012-12-21 2019-07-15 Upm Kymmene Corp Waste water and flue gas utilization
GB201315092D0 (en) 2013-08-23 2013-10-09 T & L Process Technology Ltd Improved Process
FR3081861B1 (en) * 2018-06-05 2020-05-15 Air Liquide France Industrie METHOD OF TREATING AN ALKALI INDUSTRIAL EFFLUENT USING CO2
CN111573998B (en) * 2020-06-12 2023-07-11 浙江大学 High-efficient anaerobic water-out degasification removes calcium system of waste paper papermaking waste water

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10174979A (en) * 1996-12-18 1998-06-30 Hitachi Zosen Corp Wastewater treatment method and apparatus
SE511794C2 (en) * 1997-06-30 1999-11-29 Sunds Defibrator Ind Ab Ways to reduce the content of calcium in the liquid phase in a pulp suspension
SE9803384L (en) * 1998-03-02 1999-09-03 Kemira Kemi Ab Process for treating process water

Also Published As

Publication number Publication date
EP1402111A1 (en) 2004-03-31
FI20011131A (en) 2002-12-01
WO2002097189A1 (en) 2002-12-05
DE60231303D1 (en) 2009-04-09
FI20011131A0 (en) 2001-05-30
EP1402111B1 (en) 2009-02-25

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Legal Events

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